Page 15 - คุณสมบัติของไม้ไผ่(Eng)

RESULTS AND DISCUSSION

Physical properties

The physical properties of the ten bamboo species from different part of
the culm are shown in Tables 2 and 3.

1) Feature

Among ten bamboo species, largest outer diameter of culm was that of
D. hamiltonii followed by D. asper, B. bambos, B. bluemeana, Bambusa sp.,
D. longispathus, D. strictus, T. oliveri, T. siamensis, and G. albociliata.
2) Density and specific gravity
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The average mean of density was found to range from 728 to 944 kg/m
and specific gravity from 0.65 to 0.81. T. oliveri and D. longispathus exhibited the
highest and second highest density and specific gravity respectively.

3) Shrinkage
a. Core diameter shrinkage
The culm of B. bambos showed the highest core diameter shrinkage,
while the lowest ones were found in the samples of T. oliveri and T. siamensis.

b. Thickness wall shrinkage
The highest thickness wall shrinkage was found in
G. albociliata followed by D. strictus, while B. bambos exhibited the lowest one.

c. Culm length shrinkage
The culm B. bambos showed the highest culm length shrinkage and the
lowest one appeared in D. asper.

4) Fiber saturation point (FSP)
Of five bamboo species, the highest FSP was found in T. oliveri, followed
by B. bambos, while T. siamensis exhibited the lowest FSP.
In case of physical properties of three parts of culm of ten bamboo species,
there were no differences in correlations on specific gravity and density. High
specific gravity or high density means high hardness on the surface of culm, while
low shrinkage indicates high stability of woods or bamboo dimension under green
to dry conditions.

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